[RFC PATCH v3 0/2] MIPS non-executable stack support

[Paul Burton <paul.burton@imgtec.com>]

This series allows us to support non-executable stacks on systems with
RIXI by moving delay slot instruction emulation off of the user stack &
into a dedicated page.

This is a revision of patches 6114/6125 & 6115 from a few years back:

    https://patchwork.linux-mips.org/patch/6114
    https://patchwork.linux-mips.org/patch/6125
    https://patchwork.linux-mips.org/patch/6115

The series applies atop v4.7-rc5, and is marked RFC as it could use a
little more testing before I'd be happy with it being merged.

Paul Burton (2):
  MIPS: use per-mm page to execute branch delay slot instructions
  MIPS: non-exec stack & heap when non-exec PT_GNU_STACK is present

 arch/mips/Kconfig                     |   1 +
 arch/mips/include/asm/elf.h           |   5 +
 arch/mips/include/asm/fpu_emulator.h  |  17 +-
 arch/mips/include/asm/mmu.h           |  11 ++
 arch/mips/include/asm/mmu_context.h   |   7 +
 arch/mips/include/asm/page.h          |   6 +-
 arch/mips/include/asm/processor.h     |  18 +-
 arch/mips/kernel/elf.c                |  19 ++
 arch/mips/kernel/mips-r2-to-r6-emul.c |   8 +-
 arch/mips/kernel/process.c            |   6 +
 arch/mips/kernel/signal.c             |   8 +
 arch/mips/math-emu/cp1emu.c           |   8 +-
 arch/mips/math-emu/dsemul.c           | 343 +++++++++++++++++++++++-----------
 13 files changed, 322 insertions(+), 135 deletions(-)

-- 
2.9.0